Blue print machine



Jan. 2, 1940- w. L. SULLIVAN BLUE PRINT MACHINE Filed Nov. 10, 1937INVENTOR. WfiRREN L. SULLIVAN Patented Jan. 2, 1940 UNITED STATES2,185,529 BLUE PRINT MACHINE Warren L. Sullivan, Rochester, N. Y.,assignor to Paragon Revolute Corporation,

Rochester,

N. Y., a corporation of New York Application November 10, 1937, SerialNo. 173,819

4 Claims.

This invention relates to an improved blue printing machine and to agovernor controlled friction drive unit therefor.

In blue print machines of the type wherein blue '5 print paper and atracing in superimposed positionare carried by a belt or the like past alightv source to print the tracing image on the paper, it is essentialto provide an adjustable friction device to drive the belt atpredetermined speeds.

" Such a friction device has included a driving disk withthe fiat faceof which the leather periphery of a friction wheel is held in contactunder the action of a manually adjusted spring. The pressure-between thedriving disk and the friction wheel was maintained even while the'blueprint machine was idle. As a result, when the machine stood idle for anylength of time the constant pressure of the driving disk on the leatherfriction wheel caused a flattening of the periphery of the wheel. Theresulting flat spots necessitated frequent replacement or truing up. ofthe leather ring of the wheel since the ring must be circular foreflicient operation. Also it was difficult to adjust the speed atwhichthe blue print machine was to operate, when the the machine wasidle,- since the driving disk always pressed firmly against the frictiondisk and resisted movement of the friction disk relative to the drivingdisk.

' By this invention, applicant insures proper pressure between thedriving disk and the friction disk or wheel while the apparatus is inoperation but removes any harmful pressure between the driving andfriction disks when the apparatus is idle.

Itis an object of this invention to provide a blue print machine inwhich the operating speed thereof may be more readily adjusted thanheretofore.

It is. a further object of this invention to pro vide a novel frictiondrive unit in. which the creation of flat spots on the periphery of thefriction disk is entirely eliminated.

It is another object of this invention to provide a novel friction drivein which the driving pressure 'againstthe friction wheel isautomatically and uniformly maintained when the device is running. i

It is a stillv further object of this invention to provide a frictiondrive unit in which the replacement of the leather or similar frictionmaterial ring is facilitated, by omitting positive pressure between thedriving disk and the friction disk while themachine is idle.

These and other objects of the invention will appear from the detaileddescription and the drawing in which:

Fig. 1 is an end elevation of a blue print machine made in accordancewith the invention;

Fig. 2 is an elevation of a portion of the blue 5 print machineillustrated in Fig. 1 and showing particularly the improved frictiondrive unit thereof.

Referring to Fig. 1, 5 indicates a blue print machine comprising a frame6 provided with a' fixed semi-cylindrical plate glass guide 1 topartially enclose mercury vapor lamps 8. An endless canvas apron 9 isguided about rollers l0 and the drive roll II in contact with the outersurface of the glass guide, these rollers being suitably journaled inthe frame 6. The drive roller H is provided with a sprocket l2 engagedby the driving chain l3, which is driven by a second sprocket M mountedon the shaft [5 journaled in the frame of the machine. 20

Referring to Fig. 2 there is shown in detail, the improved frictiondrive unit for rotating the shaft I 5 and sprocket M which in turndrives the chain 13 to rotate the sprocket l2 and thereby move theendless apron 9 over the several rollers l0 and 25 the guide 1.

Reference character [6 indicates a support for the friction drive unitwhich'may be bolted to or formed integrally with the frame 6 of themachine. Bearing brackets ll preferably formed 30 integral with thesupport It receive the bearings I8, one bearing being secured in fixedrelation to the support I6 by means of a-taper pin l9 to maintain adrive shaft 2i] in proper relation to a driven shaft 29 to be describedhereinafter. A 5 driving sheave 2 l pinned or keyed to the shaft 20, isprovided with peripheral grooves of different diameters in either ofwhich a belt 22 driven by a motor (not shown) engages. Theleft end ofthe shaft 20, as viewed in Fig. 2, is of reduced diam- 40 eter andprovides a shoulder 23 against which the collar 24 abuts. The reducedportion of the drive shaft has mounted thereon a governor '25whichcomprises a generally annular casting 2B and L-shaped levers 27pivoted at 28 on diamet- 45 rically opposed portions thereof. The outerends of the long arm. of the levers 2'! are enlarged or provided withweights 29 whilethe short arms 30 thereof abut the collar 24. A key 3|in the shaft 20 seats in the key-way 32 of the casting 26 so 50 that thegovernor will rotate with the drive shaft 20, but the shaft will be freeto move longitudinally relative to the governor. By this construction itwill be seen that as the drive shaft rotates, the governor balls 29 willmove outwardly or away 55 an the shaft 2?} from the shaft 20 causing theshort arms 30 of the levers 21 to press against the collar 24. Since thecasting 26 abuts the thrust bearing 33, disposed between the casting andthe fixed bearing 18, the shaft will be moved toward the right.

A vertical driven shaft 34 mounted in the bearings '35 of the support 16carries a friction disk or wheel 36 secured thereto by a set screw 31seated in theiihub 38. This zwheel includes a plate+ 39 and a frictionring ill which projects beyond the periphery of the wheel and which isheld on the plate by means of the clamping ring 4|. The friction ringmay be made of leatherncorlcror other suitable material. The peripheryof the friction ring M) is of such-diameter that it willbe slightlyspaced from or just barely-in....contact with the flat or friction face42 of the driving disk 2 l. The shaft 34 has securedicthereto a W0r1m i3which is in driving engagement with the worm gear 44 mounted on theshaft Hi. Itwill be re- :palIedJ-that Ethe :shaft 5? has a sprocket l 4,fixed thereon to drive the chain I3.

zirlrrzorderito chan e: the speed .of the shaft: 3i, andazconseeentlyethe speed -ofthe 1 chain. it and .:the apron.i,,';tl11isshaft-,carnbeiadjusted vertically einctha bearingagfif:;byim eans-.of alever 4 5;.pivvoted {at-:58 onrthe support --!8.One-'endpf the lever 45 is pivoted at ll to a collar 18 mounted xhetween/the ;thrust bearings-i Mi-mand. the fixed zcollarsseilrlocked onthe shaft fi thy means of the setrscrews 51. ByrshiftingtheleverAE aboutpivot 23 46;:the shaft may -be raised, or .lowered-to movezthe-f-rictiondisk- 36 away from ontowardrthe center-of thegdriving disk along the E=.face' thereof fern-the, :purpose a of increasing .or

decreasing the: speed of ethe shaft 34. Theqabove described:unitoperates :as :follows. -As;- -..eadrive shaft is-rotated bymeansofthe belt 2; the: governor weights 2 Shy-outward. and-movetoward.-,-the:right (Fig. 2) ,tosbring the 'fiatiopfrietion face 52-ofthasheave :2] into -1drivingengagement withthe leather ring AU-of'the' .frictioniwheelz-s'ifi. .When- 'theipoweris cut ofhand theShaft-:29 decelerates,:the'governor ceases to function: .-and *thelevers 21 .returnto the position shown in Fig. 1, so that-:thereis no 41positive pressure exerted by rthe ,sheave- 2 l K againstithedeatheriring :46. v The blue print-machine is 1 operated -as;fol1ows. Assensitizede'paper a52 fed-from: the supportijii, -moves =acrossthe-table 5A,. tracings (not shown) are, superposed thereon. .-The..paper and the tracings guided by .the.- mernber :55 are carried hytheapron 9 aroundiandtbelow the plate .glass guide l. withi the-lamps 8therein; to expose-the sensitized paperth-rough; the tracings. r In,order a-tocontrol-the speed of travel-of the endlessapron,a'rb-ei'l-erank lever .5545 pivoted-lat; 51-;on the frame ii alsoprovided with the-segment- 58.,to whiclrthe lever .-;5ii"can be lockedin .a-diusted position by -meansz-0f the hand nut 99., The ,shortarmrjfiii ofthe lever fifi is conr-l-ectedtox the vleverJiti-by meansofathe -link'fil. -It will be seen -that cby -movinglthedever fitabcutthe pivot =51, the lever ifi is moved aboutthepivot-Afi to raise.or-lower. the shaft M; and thereby movethe .frictionadisk-tfi'alongrthe face of the driving the ring if? is prevented.

driving, disk into engagement. withsaid. friction disk 2i. As previouslymentioned, this changes the speed at which the shaft 34 will rotate. The

adjustment of the speed at which the apron!) is to travel can be readilyaccomplished even while the machine is idle since there is no positivepressure between the friction face l?! and the friction ring 38. Asmentioned heretofore, by

omitting positive pressure betweenthe face 42 I .-;of theisheave 2t-andthering; MLzLWhEmthe machine is 'idle,'the creation "of flattened spotson While one specific embodiment of the invention has heenidisclosed, itwill be apparent that many modifications, variations and adaptationswill occur to'thoseskilled in theart. The invention isztherefor not .tohe considered as limited by the description but is to apply to allmodifications,

' variations andtzadaptations that fall within the scopeof the appendedclaims.

What claim is:

;.1. ,A ,.power transmission unitg-pomprisi-ng alongitudinally.movabledrive. sh af a disk-having one face thereofsecuredwnzoneenduofzsaidadriveefacefof the disk;.and a governormountedensaid .drive shaftl-adaptedetof move esaidqdrive shaft: EtO

daring the: flat .face- .of maids-disk. into driving en- Q30 .gagementWitr asaid frictionwheel'when theid-riye' 2t AHPOWEI ransm-ittingedevicecomprising.a

. longitudinally movable .drive' shaft, a driving-disk:fiXf-ZdtOOliBaGhdOf saidv shaft aqdrivenfshaft, 2.,5 5'

friction ,disk; on. said driven .:shaft,.; a governor! .on isaidldriveshaftoperable-by the, rotation ofasaid j drive. shaft to movesaid:drive; shaft: to .bringfisaid ;.disk.

.device. comprising a.longitudinallvmovable drive .shaft, a, -nlrivile.diskfixeo1.to... me ,endiof said shaft,, a. pdrivenflshafh. afriction, .disk-.ion...said

driven shaft, a governor-humid .drive..shaft..op- 5,45 7

' 11: 1.0 3. ,A power transmitting landQSpBBd. controlling erable by therotation ofsaid drivenshafttomove said driveshaft to bring .sai'd..driving'Jdisk. into engagement with .said, friction disk,. and rneansfor relatively moving said frictionflisk and..drivingQdisk to ;vary};thespeed, of rotation of said Q 0 7 driven shaft.

4. A variable speed power-transmission iinitf comp-rising alongitudinally-movablejdrive shaft,

adiskhaving-one face thereofsecured on oneend of said drive shaft, theother face of said-disk governor. :mounted. on 1 said-.-drive."shaftadapted .-.to move said drive shaft to bring t-heiflatcface -.of said diskgin-to zdriving aengagement with said frictionwheel-tWhenrthevdrive shaft' is rotated,

and means:for longitudinallyeslnftingiseidadriven i shafttdmovesaidrfriction wheel relative .torsaid w --disk-to adjustthespeedof:thedrivemshaft. WARREN ,Lr' SUIiIJIVAN.

